Geodesic
Restricted ideals and the groupability property. Tools for temporal reasoning
Kybernetika, Tome 39 (2003) no. 5, p. [521].

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In the field of automatic proving, the study of the sets of prime implicants or implicates of a formula has proven to be very important. If we focus on non-classical logics and, in particular, on temporal logics, such study is useful even if it is restricted to the set of unitary implicants/implicates [P. Cordero, M. Enciso, and I. de Guzmán: Structure theorems for closed sets of implicates/implicants in temporal logic. (Lecture Notes in Artificial Intelligence 1695.) Springer–Verlag, Berlin 1999]. In this paper, a new concept we call restricted ideal/filter is introduced, it is proved that the set of restricted ideals/filters with the relation of inclusion has lattice structure and its utility for the efficient manipulation of the set of unitary implicants/implicates of formulas in propositional temporal logics is shown. We introduce a new property for subsets of lattices, which we call groupability, and we prove that the existence of groupable subsets in a lattice allows us to express restricted ideals/filters as the inductive closure for a binary non-deterministic operator and, consequently, the presence of this property guarantees a proper computational behavior of the set of unitary implicants/implicates.
Classification : 03B35, 03B44, 03D70, 03G10, 06A15, 68T15
Keywords: lattice; ideal; induction; temporal reasoning; prime implicants/implicates 
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     title = {Restricted ideals and the groupability property. {Tools} for temporal reasoning},
     journal = {Kybernetika},
     pages = {[521]},
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     zbl = {1249.03004},
     language = {en},
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Martínez, J.; Cordero, P.; Gutiérrez, G.; Guzmán, I. P. de. Restricted ideals and the groupability property. Tools for temporal reasoning. Kybernetika, Tome 39 (2003) no. 5, p. [521]. http://geodesic.mathdoc.fr/item/KYB_2003__39_5_a2/